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A film transfer shaping method of dry fiber fabric and its application

A fiber fabric and dry state technology is applied in the field of film transfer and shaping of dry state fiber fabrics to achieve the effects of ensuring molding quality, reducing deformation and improving adhesion.

Active Publication Date: 2021-06-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is: to overcome the deficiencies of the existing fiber fabric sizing technology, to provide a film transfer sizing method for dry fabrics in the liquid forming process, which improves the bonding force between fabric layers and greatly Significantly reduce the amount of fiber sizing agent, reduce the amount of fiber deformation during preform preparation, improve the preparation quality of fiber preform, and finally ensure the molding quality of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A film transfer shaping method of dry fiber fabric and its application
  • A film transfer shaping method of dry fiber fabric and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Styling agent material: solution type setting agent Tack328 (solution type, solid content 17%)

[0054] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0055] The first step is to weigh Tack328 sizing agent at 29.1g per square meter (the solid content is equivalent to 3% of the weight of the G0827 fabric) and evenly spray it on the release paper. After the solvent evaporates, the sizing agent will form uniform spots on the release paper Shaped or flake-shaped adhesive film;

[0056] In the second step, the rolled G0827 unidirectional carbon fiber fabric is spread along the fiber direction on the release paper coated with a sizing agent, and the sizing agent film is transferred to the surface of the dry fiber fabric through a certain contact pressure, and the fabric and the release paper Coil together and reserve;

[0057] The third step is to unfold the rolled G0827 unidirectional carbon fiber fabric that has be...

Embodiment 2

[0065] Styling agent material: bisphenol A epoxy resin and hexafluoropolyaryletherketone prepolymer (dry setting agent).

[0066] Solvent: a mixed solvent made of tetrahydrofuran and acetone at a weight ratio of 1:1.

[0067] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0068] In the first step, the dry setting agent (bisphenol A epoxy resin and hexafluoropolyaryletherketone prepolymer) is dissolved in a mixed solvent of tetrahydrofuran and acetone (weight ratio 1:1) to make a solid content of 30 % of the fixative solution.

[0069] In the second step, weigh the sizing agent solution according to the solid content equivalent to 1% of the weight of the G0827 fabric, and evenly brush it on the release paper. After the solvent evaporates, the sizing agent will form uniform dots or flakes on the release paper Adhesive film;

[0070] The third step is to spread the roll of G0827 unidirectional carbon fiber fabric on the...

Embodiment 3

[0078] Embodiment 3 (existing shaping method)

[0079] Styling agent material: solution type setting agent Tack328 (solution type, solid content 17%)

[0080] Fabric type: G0827 unidirectional carbon fiber fabric, surface density 165g / m 2 , fiber type T300-3k.

[0081] The first step is to roll out the roll of G0827 unidirectional carbon fiber fabric, weigh Tack328 sizing agent (solid content is equivalent to 6% of the weight of G0827 fabric) at 58.2 per square meter, and directly spray the sizing agent on the fiber;

[0082] The second step is to cut the fabric into 13 pieces of 300mm×300mm in size after the setting agent solvent evaporates;

[0083] The third step is to lay 13 layers of fabric layer by layer, and handle with care to avoid fiber deformation.

[0084] See Example 1 and Example 2 for the preparation method of the preform of the present invention, and Example 3 for the method for preparing the preform in the prior art.

[0085] Put the preforms prepared by t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a method for film transfer and shaping of dry fabrics and its application. The method comprises: covering the upper surface or the lower surface of the release paper with a sizing liquid, and obtaining a release paper with a viscous film after the solvent volatilizes; spreading the dry fiber fabric along the fiber direction on the release paper, and applying pressure to make it The adhesive film is pasted on the surface of the fiber fabric; the dry fiber fabric is cut to obtain N fiber fabrics with release paper on one side, which are respectively used as the first layer of fiber fabric and the second layer of fiber fabric. N layers of fiber fabrics; sticking the sticky film in the release paper with the sticky film on the side of the first layer of the fiber fabric without the release paper; paving, and finishing shaping after the paving is completed to obtain a fiber preform. The method improves the bonding force between fabric layers, reduces the amount of fiber setting agent, reduces the amount of deformation of fibers during the preparation of the preform, improves the preparation quality of the fiber preform, and finally ensures the molding quality of the product.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for film transfer and shaping of dry fiber fabrics and its application. Background technique [0002] The low-cost liquid molding process of composite materials (such as RTM, VARI, etc.) has been widely used in various technical fields of composite materials, and has gradually developed from the production of secondary load-bearing structural parts to the main load-bearing structural parts. One of the key technologies in the composite material liquid molding process is the preparation technology of the product fiber preform. Fiber preforms require a large amount of dry carbon fiber fabrics or glass fiber fabrics. Since dry fiber fabrics are not impregnated like prepregs, they are prone to deformation, resulting in fiber buckling, ply angle deflection, etc., and directly affect Product preform quality and final product quality. Therefore, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B11/00B29C70/46
Inventor 龚文化卢山许亚洪
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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